Launch RPM

[weedburner]

Originally Posted by Sean Marconette

Terry,
On my car I keep the rpm drop to around 2000 and the clutch lockup on launch no more than 0.9 seconds. .9 seconds is too loose, and is based on the input shaft moving till the engine and input shaft rpm are the same. A general rule has been .3 to .8 on lockup. If you start getting to .3 the clutch may drag the engine down way too much and then the engine struggles to recover. This is where data acquisition is money well spent and can help you maintain clutch maintenance and performance.

Sean

I've found that clutch slip time usually overlaps a bit with tire slip time, so i'm thinking your overall slip time between the engine and track is likely longer.

I'm dead hooking with radials, so the clutch does all the work. It seems the longer i let the clutch slip the faster it goes, for me around 1 sec is a good compromise. I shoot for zero rpm drop but when a 500 drop is spread over a second or so, it makes little difference.

Grant